Per Federal Voting Assistance Program (FVAP), if you requested your absentee ballot and haven’t received it from your State at least 30 days before the election, you can use the Federal Write-In Absentee Ballot (FWAB). The FWAB is an emergency backup ballot but can only be use to vote for federal offices. This backup ballot can be completed using the FWAB online assistant, by filling out the PDF or picking up a hard copy version from your nearest U.S. embassy or consulate. The online assistant will guide you through the process of completing the form. More info here via FVAP.

FVAP notes that they will be around on election day and if you have any questions about voting absentee, you may call their toll-free helpline at 1-800-438-VOTE or email them at vote@fvap.gov. On Nov. 6 FVAP will be available for extended hours, from 6 a.m. to 8 p.m. EST, to assist voters wherever they are.